Now that I've watched some Xenoblade gameplay, I'd love to have Shulk in the game.
Reason 1: He kinda looks like me
Reason 2: His sword is ****ing awesome and I like its name: Minado. Kinda like my name (Nando) and the 4th hokage's name from Naruto (Minato)
Or my name combined with my little brother's name: Mika.

I know those reasons are kinda weird but.. yeah. The biggest reason is just his look and his awesome sword.

Oh and the Choir Men would be really epic to play as. They could stand on eachothers backs, to throw a mid-air punch or they could grab their arms and roll around like Jigglypuff or two of them could grab a player and the third one would stand on their shoulders and pummel him. Just funny awesome stuff like that.